find program files x86 folder in .net 2008

Below provided function will return the x86 Program Files directory in all 3 of the windows configurations

32 bit Windows
32 bit program running on 64 bit Windows
64 bit program running on 64 bit windows

static string ProgramFilesx86()
{
    if( 8 == IntPtr.Size || (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("PROCESSOR_ARCHITEW6432"))))
    {
        return Environment.GetEnvironmentVariable("ProgramFiles(x86)");
    }

    return Environment.GetEnvironmentVariable("ProgramFiles");
}